https://fgchen.com/wiki/index.php?action=history&feed=atom&title=SCJP_1.6%E7%89%88%E8%80%83%E9%A1%8C_160
SCJP 1.6版考題 160 - 修訂歷史
2026-04-13T15:43:43Z
本 Wiki 上此頁面的修訂歷史
MediaWiki 1.29.0
https://fgchen.com/wiki/index.php?title=SCJP_1.6%E7%89%88%E8%80%83%E9%A1%8C_160&diff=1257&oldid=prev
Ikk：新頁面: Given: 22. StringBuilder sb1 = new StringBuilder("123"); 23. String s1 = "123"; 24. //insert code here 25. System.out.println(sb1 + " " + s1); Which code fragment, inserted at ...
2013-03-30T02:37:31Z
<p>新頁面: Given: 22. StringBuilder sb1 = new StringBuilder("123"); 23. String s1 = "123"; 24. //insert code here 25. System.out.println(sb1 + " " + s1); Which code fragment, inserted at ...</p>
<p><b>新頁面</b></p><div> Given:<br />
22. StringBuilder sb1 = new StringBuilder("123");<br />
23. String s1 = "123";<br />
24. //insert code here<br />
25. System.out.println(sb1 + " " + s1);<br />
<br />
Which code fragment, inserted at line 24, outputs "123abc 123abc"?<br />
A. sb1.append("abc"); s1.append("abc");<br />
B. sb1.append("abc"); s1.concat("abc");<br />
C. sb1.concat("abc"); s1.append("abc");<br />
D. sb1.concat("abc"); s1.concat("abc");<br />
E. sb1.append("abc"); s1 = s1.concat("abc");<br />
F. sb1.concat("abc"); s1 = s1.concat("abc");<br />
G. sb1.append("abc"); s1 = s1 + s1.concat("abc");<br />
H. sb1.concat("abc"); s1 = s1 + s1.concat("abc");<br />
<br />
<div class="toccolours mw-collapsible mw-collapsed"><br />
<span style="font-size:medium;">解答</span><br />
<br />
----<br />
<div class="mw-collapsible-content"><br />
<span style="font-size: medium;">Ans: E </span><br />
<br />
<span style="font-size:medium;"> 解說:<br />
StringBuilder說明，請參考1.5答案解析28頁<br />
基本上StringBuilder與StringBuffer一樣，字串內容可以改變，不像String是一個內容不可變的字串物件，<br />
String型態的任何操作都會產生新的字串物件，必須將參考指向新的字串物件，才能存取改變後的字串。<br />
</span> <br />
</div></div><br />
{{SCJP 1.6版考題講解}}</div>
Ikk